Clock and watch with twenty-four hour figure indication



A il 3, 192a ESCHWANKE c Locx AND ymi'ca WITH TWENTY-FOUR HOUR FIGURE INDICATION Filed Feb. 21, 1927 an venior Patented Apr. 3, 1928.

UNITED STATES PATENT OFFICE.

EWALD SCHWANKE, 0F WALDSHUT, GERMANY.

CLOCK AND WATCH WITH TWENTY-FOUR HOUR FIGURE INDICATION.

Application filed February 21, 1927, Serial No. 170,017, and in Germany February 22, 1926.

It is a well known fact, that the 24-hour figure-indications for clocks and watches actually in use have great inconveniences, such as unconciseness, calculation and so on.

The present invention avoids all inconveniences in such a manner, that, notwith standing two dial plates being used, always only the actual hour-indications from 1 to 12 respectively or from 13 to 24 will be seen on the stationary front dial.

The 24 hours of the day are divided into two sections, one dial, the front one, carrying the figures from 1 to 12 inclusive, and the other dial, the hind one, carrying the figures from 13 to 24 inclusive. The two dials, of which the front one is stationary and the hind one displaceable, are so disposed that, when the displaceable hind dial is automatically displaced for a small angle, the figures 13 to 24 of said dial cover the figures 1 to 12 of the stationary front dial,- automatically uncovering the figures of the stationary dial when returning, after 12 hours, into its initial position.

One form of execution of the improved device is shown, by way of example, in the accompanying drawing, wherein Fig. 1 is a front elevation of the improved device, the stationary dial, carrying the figures 1 to 12 being partly broken away.

Fig. 2 is a section on line A-B of Fig. 1.

The figures 1 to 12 are provided on the front stationary dial a and the figures 125 to 24 on the hind displaceable dial Z).

Each figure or hour of ,the day is stamped out of the dial plates a and b, with the exception however of small portions 0 and c (Fig. 1). The thus partly stamped out aps, carrying the figures (Z of the front stationary dial a are slightly bent inward. The partly stamped out flaps carrying the figures f of the hind displaceable dial 7) being slightly bent outward (compare Fig. 2).

Care has to be taken that the unstampcd portions 0 of the front dial a be positioned on an imaginary circular axis passing through the figures 1 to 12 (Fig. 1 portions 0). In contradistinction thereto, the unstamped portions e of dial I) have to be positioned opposite the portions 0 so as to permit a free and correct covering of the stationary gures 1 to 12 when said dial 1) is being displaced.

Dial b is further fitted with an abutment pin 9 or the like which comes in engagement with a suitable switch, not shown in bent inwards the drawings. As dial 6 has to move to and fro once every 24 hours, a switch with spring control or the like could be used.

Referring to Fig. 2, looking at the clock in the direction of arrow 1, the operation of the improved figure-indication will be come quite clear.

In the Fig. 1 of the drawing, the figure which is equal to 1 oclock lies opposite to the viewer of the dial-plate, and the figure which is equal to 14 oclock is covered. The figure which is equal to 2 oclock is visible and the figure which is equal to 15 oclock is covered and so on.

Supposing that 12 oclock is just striking, abutment pin 9 of the displaceable dial 6 will automatically be moved for an angle m (Fig. 1) from position 1 12 to position 1324. Said movement is shown in Fig. 1, arrow 1. The back flaps f of the displaceable dial Z) carrying the figures 13, 14, 15 and so on will, at this occasion, be pushed in front of the next following flaps d of the stationary dial a, thus figures 13 to 24 appearing in the stamped out portions of dial a covering in this manner the figures l to 12.

At midnight, the reverse movement of dial .7) will take place, uncovering thus the hours 1 to 12 again, and so on.

I claim:

1. Clocks and watches with twenty-four hour figure indications, comprising a front stationary dial, partly stamped out portions forming inwardly bent flaps provided with the hour figures from 1 to 12.

2. Clocks and watches with twenty-four hour figure indications, comprising a rear displaceable dial, partly stamped out portions forming outwardly bent flaps provided with hour figures from 13 to 24.

3. Clocks and watches with twenty-four hour figure indications, comprising a front stationary dial, partly stamped out portions forming simultaneously windows in which the hours from 1 to 12 appear, a rear displaceable dial with partly stamped out portions forming outwardly bent flaps carrying the hour indications from 13 to 24, means for displacing said rear dial in such a manner that the figure-indicationsof said rear dial appear in the openings of the front dial, covering the hours from 1 to 12.

In testimony whereof I afiix my signature.

EWALD SCHWANKE. 

